[Architecture/fix] Throw explicit error for invalid configuration causing overlapping nodes

[NicolasNewman]

📑 Summary

To avoid user confusion, Architecture diagrams now explicitly throw an error if two services attempt to connect to the same side of another service.

Resolves #6120

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	339 added, 339 removed, 4 failures	Jan 9, 2025, 7:04 PM